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24C04A-SM Datasheet(PDF) 6 Page - Microchip Technology |
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24C04A-SM Datasheet(HTML) 6 Page - Microchip Technology |
6 / 12 page 24C04A DS11183E-page 6 © 1998 Microchip Technology Inc. 6.0 PAGE PROGRAM MODE To program the master sends addresses and data to the 24C04A which is the slave (Figure 6-1 and Figure 6-2). This is done by supplying a START condi- tion followed by the 4-bit device code, the 3-bit slave address, and the R/W bit which is defined as a logic LOW for a write. This indicates to the addressed slave that a word address will follow so the slave outputs the acknowledge pulse to the master during the ninth clock pulse. When the word address is received by the 24C04A, it places it in the lower 8 bits of the address pointer defining which memory location is to be written. (The A0 bit transmitted with the slave address is the ninth bit of the address pointer). The 24C04A will gen- erate an acknowledge after every 8-bits received and store them consecutively in a RAM (8 bytes maximum) buffer until a STOP condition is detected. This STOP condition initiates the internal programming cycle.. If more than 8 bytes are transmitted by the master, the 24C04A will roll over and overwrite the data beginning with the first received byte. This does not affect erase/ write cycles of the EEPROM array and is accomplished as a result of only allowing the address registers bot- tom 3 bits to increment while the upper 5 bits remain unchanged. If the master generates a STOP condition after trans- mitting the first data word (Point ‘P’ on Figure 6-1), byte programming mode is entered. The internal, completely self-timed PROGRAM cycle starts after the STOP condition has been generated by the master and all received data bytes in the page buffer will be written in a serial manner. The PROGRAM cycle takes N milliseconds, whereby N is the number of received data bytes. FIGURE 6-1: BYTE WRITE FIGURE 6-2: PAGE WRITE S P BUS ACTIVITY MASTER SDA LINE BUS ACTIVITY S T A R T S T O P CONTROL BYTE WORD ADDRESS DATA A C K A C K A C K S P BUS ACTIVITY MASTER SDA LINE BUS ACTIVITY S T A R T CONTROL BYTE WORD ADDRESS (n) DATA n DATA n + 7 S T O P A C K A C K A C K A C K A C K DATA n + 1 |
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